將大文本文檔分割爲多個較小的文本文件

Question

我正在開發一個文本採集引擎，它使用fwrite()來編寫文本，但我想在寫入過程中放置​​一個1.5 MB的文件大小上限，所以如果文件大於1.5 mb它會從停止的地方開始寫一個新的文件，直到它將源文件的內容寫入多個文件。我有谷歌搜索，但很多教程和例子對我來說太複雜，因爲我是一個新手程序員。下面的代碼位於for循環內，該循環提取文本（$RemoveTwo）。它不起作用，因爲我需要。任何幫助，將不勝感激。

 switch ($FileSizeCounter) { 
      case ($FileSizeCounter> 1500000): 
       $myFile2 = 'C:\TextCollector/'.'FilenameA'.'.txt'; 
       $fh2 = fopen($myFile2, 'a') or die("can't open file"); 
        fwrite($fh2, $RemoveTwo); 
        fclose($fh2); 
       break; 
      case ($FileSizeCounter> 3000000): 
       $myFile3 = 'C:\TextCollector/'.'FilenameB'.'.txt'; 
       $fh3 = fopen($myFile3, 'a') or die("can't open file"); 
        fwrite($fh3, $RemoveTwo); 
        fclose($fh3); 
       break; 
      default: 
       echo "continue and continue until it stops by the user"; 
     } 

Answer 1

試着做這樣的事情。您需要從源代碼讀取，然後一塊一塊地檢查源文件的結尾。當你比較max和緩衝值，如果它們是true，然後關閉當前文件並打開一個新的帶有自動遞增的數字：

/* 
** @param $filename [string] This is the source 
** @param $toFile [string] This is the base name for the destination file & path 
** @param $chunk [num] This is the max file size based on MB so 1.5 is 1.5MB 
*/ 
function breakDownFile($filename,$toFile,$chunk = 1) 
    { 
     // Take the MB value and convert it into KB 
     $chunk  = ($chunk*1024); 
     // Get the file size of the source, divide by kb 
     $length  = filesize($filename)/1024; 
     // Put a max in bits 
     $max  = $chunk*1000; 
     // Start value for naming the files incrementally 
     $i   = 1; 
     // Open *for reading* the source file 
     $r   = fopen($filename,'r'); 
     // Create a new file for writing, use the increment value 
     $w   = fopen($toFile.$i.'.txt','w'); 
     // Loop through the file as long as the file is readable 
     while(!feof($r)) { 
      // Read file but only to the max file size value set 
      $buffer = fread($r, $max); 
      // Write to disk using buffer as a guide 
      fwrite($w, $buffer); 
      // Check the bit size of the buffer to see if it's 
      // same or larger than limit 
      if(strlen($buffer) >= $max) { 
       // Close the file 
       fclose($w); 
       // Add 1 to our $i file 
       $i++; 
       // Start a new file with the new name 
       $w = fopen($toFile.$i.'.txt','w'); 
      } 
     } 
     // When done the loop, close the writeable file 
     fclose($w); 
     // When done loop close readable 
     fclose($r); 
    } 

使用方法：

breakDownFile(__DIR__.'/test.txt',__DIR__.'/tofile',1.5);